Apps like NanoStudio or BeatMaker 2 could be used like that.Found from the NS website:
It doesn't stop there. NanoStudio allows you to use multiple synths simultaneously, each with its own insert effects such as waveshaping, chorus and delay. When you want to go beyond basic oscillators, load up a sample and process it just like a normal synth voice - great for mashing up vocals or even the whole mix.Please don't tell me that I can sequence all these synths from my OT, one synth per midi channel using that coremidi thingy, please don't tell me that or I'm bound to buy an ipad this week end
